Luckily for him it’s the rocket engineers that Musk hires that have designed and built them, not Elon himself. Given his current record for attempting to run Twitter, this should be obvious.
Also it's all under the supervision and regulatory framework of the US government, he has zero choice about doing full tests and checks to their satisfaction before they'll even consider allowing them to launch, let alone launch with a human on board.
Space X has done great, but I suspect it's going to be despite Musk's "technical help" rather than thanks to do, as it's starting to become very clear that the thing Musk is best at is being a sales person, in the classic IT sense, promise big and trying to keep the money coming in until the company can start to deliver on what was promised or it's no longer relevant.
Having seen Musk's approach to Twitter and Tesla the thought of him being the one that chooses when you do something like put a human in a new space craft is scary.
I read this morning that Tesla are right down there in terms of customer satisfaction.
Those of us who doubt the longevity of the company now the big boys are entering the electric market may have a point.
TBH from what i've heard/seen of Tesla's cars, the QC on them seems to be worse than a budget Kia from 20 years ago, certainly his customers seem to be willing to put up with issues that would have gotten complaints from someone paying £8k* for a car, let alone £30k+, and many of them seem to be because he didn't want to sort out a proper production line and was desperate to ship vehicles with known issues** to meet projections in the knowledge that he could bluff some of the issues as "well that's normal" and get others fixed after delivery despite that being far more expensive for the company and inconvenient to the customer than to catch them (or better yet to fix the issues on the production line) before they left the factory.
Tesla were for a long time the only real electric car producer which gave them a huge lead, and if they'd looked at the lessons the other car manufacturers learned over the last 100+ years, they would probably be in a much better position now than they are, instead they seemed to assume the other car manufacturers wouldn't eventually start making electric cars with properly thought out production lines and in large quantities, forgetting that as a car manufacturer you either need to be niche with a product people are willing to pay a premium for (or the only one in that market so the "classic" luxury cars, Jaguar, Porche etc), or make enough efficiently enough to get the savings from bulk.
*I'm not kidding, I had a Rio in 2001 that cost £6.5k new, and it had better panel lines than what I've seen many Tesla owners defend as "normal". It was a fairly rubbish car in terms of features, but it was built to a consistent standard (I gave it to my sister in '13, it lasted another 3 years without even basic servicing).
**IIRC apparently a lot of one model of Tesla have a "rattle" in the back, which if what i've read is true is because Tesla demanded a very specific design for part of a rear axel casting despite being warned it would have a high failure rate in casting***, then shifting production from the company they originally had making it to another because the original company wouldn't pass the failed ones (causing delays), but the second supplier was quite happy to ship them out with bits of waste metal trapped and bouncing around, or casting that was thinner than spec and thus more likely to crack.
***Not the fault of the company casting it, as complex castings always have a higher failure rate but the way you normally deal with that is to try and adjust the design, or you allow for it in how much you're willing to pay per "good" casting and the company can then do more casts at once to allow for X% failing without it impacting delivery rates.